Feature:1. Made of sapphire crystal glass, not easy to break, strong and durable. Good transparency, smooth surface, high temperature resistance, scratch resistance, wear resistance. It is clearer and more beautiful than flat glass2. The watch glass lens is very transparent, with rounded and smooth edges, comfortable hand feel, no scratches.3. Easy to install and replace, the broken one can be easily replaced. It's very suitable for watch repairman to repair their watch by themselves.4. The sapphire crystal glass is easy to clean, and only needs to be wiped clean with a soft cloth after long-term use.